Malicious PDF — malware analysis report

Static analysis result for SHA-256 258237d57011a025…

MALICIOUS

PDF

88.8 KB Created: 2021-07-02 03:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9974d0056cd62c17a05e65322885f60e SHA-1: 9b7610e2ae0b52c853afd434de5c636266b86c56 SHA-256: 258237d57011a025e5181ca02f2c0b020d835b7a55c8cfbf544c286e00b4cf2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ewt.cz/res/file/gebiriderofoviz.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fuf4dvhfjhpu5eh3udc8t8o321/45689205571.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0gfa8cpcd61l1heq6so705u918/10027409750.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/476951d729ed6e670a6447e023ed41cc/65743538880.pdf
    • http://anhbanglaw.com/userfiles/file/wabawilexotavisagutev.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/20017226398.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/78eb411bb5ebe520b5e6620b6190465f/kakusobovukap.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3gs1rdpkkcln4vq265dpheiod5/72340097643.pdf
    • http://baigeleather.com/userfiles/file/34954396750.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/66939446407.pdf
    • http://autoscuolauniversale.it/userfiles/files/96656623104.pdf
    • http://conblocmanado.com/pics/file/76866648695.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0ea1c8a5---numage.pdf
    • https://alamansyria.com/userfiles/file/kegod.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160762d2814fc4---kadepaluwebadafujavevoka.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f23762f6---3111316946.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/96ed47fa92eb3ce59cb0273b5ce3aff1/pumugufixipuminoge.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/lakuvusebawewimox.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/dd345ad7b304ab8308deeca587071eea/27605538488.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2ik5vu6aepptr6rr93br3ervu0/sejigelomovakuxofenipiw.pdf
    • http://adamlegal.com/userfiles/file/9926976600.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1315b3c8---kirifovafutofaxavov.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7eada244---27378430413.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a768d7263---25676698157.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=growing+old+alone+quotes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f646.bin
b2e4916706410490c980c1f5a405a9f69a6f30d750913d8784daa1139c8c15ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 17492 bytes
font_01_sfnt_off000123fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 16792 bytes
font_02_sfnt_off00013c14.bin
cbcb96d56af0cf8a0547fd7e906338458e0e28cb1bf0f124440ef79fc06fe5d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C14 10792 bytes